How to check whether php is connected to the database

How to connect to the php database and how to determine whether the database connection is successful.

Create a new php file (recommended learning: PHP video tutorial)

## Set variables and use the mysql_connect() function to connect to the database. The parameters in brackets are the database address, user name and database password

Judge by if

If the connection is successful, output: Database connection is successful

If the database is not connected to the output die() function, the database connection fails and mysql_error() is used to output the error

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